GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill by segment for the six months ended June 30, 2018 were as follows (in thousands):



	Environmental Services			Safety-Kleen			Totals
Balance at January 1, 2018	$	172,386		$	306,137		$	478,523
Increase from current period acquisition	21,626			—			21,626
Measurement period adjustments from prior period acquisitions	(78		)	—			(78		)
Foreign currency translation	(1,305		)	(1,515		)	(2,820		)
Balance at June 30, 2018	$	192,629		$	304,622		$	497,251

Summary of indefinite-lived intangible assets

As of June 30, 2018 and December 31, 2017, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):



	June 30, 2018						December 31, 2017
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	175,317	$	76,707	$	98,610	$	174,721	$	74,347	$	100,374
Customer and supplier relationships	399,012		170,866		228,146		399,224		158,972		240,252
Other intangible assets	37,431		31,107		6,324		36,766		31,592		5,174
Total amortizable permits and other intangible assets	611,760		278,680		333,080		610,711		264,911		345,800
Indefinite lived trademarks and trade names	122,840		—		122,840		123,328		—		123,328
Total permits and other intangible assets	$	734,600	$	278,680	$	455,920	$	734,039	$	264,911	$	469,128

Schedule of finite-lived intangible assets

As of June 30, 2018 and December 31, 2017, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):



	June 30, 2018						December 31, 2017
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	175,317	$	76,707	$	98,610	$	174,721	$	74,347	$	100,374
Customer and supplier relationships	399,012		170,866		228,146		399,224		158,972		240,252
Other intangible assets	37,431		31,107		6,324		36,766		31,592		5,174
Total amortizable permits and other intangible assets	611,760		278,680		333,080		610,711		264,911		345,800
Indefinite lived trademarks and trade names	122,840		—		122,840		123,328		—		123,328
Total permits and other intangible assets	$	734,600	$	278,680	$	455,920	$	734,039	$	264,911	$	469,128

Schedule of expected amortization for the net carrying amount of finite lived intangible assets

The expected amortization of the net carrying amount of finite-lived intangible assets at June 30, 2018 was as follows (in thousands):



Years Ending December 31,	Expected Amortization
2018 (six months)	$	16,927
2019	32,143
2020	29,850
2021	27,381
2022	27,222
Thereafter	199,557
	$	333,080